Impulse-receiving circuit



P. H. BURTON IMPULSE RECEIVING CIRCUIT Filed April 26, 1923 o o o o o o o o o 0 0:

//4 M07 mal //7 en/0r. Perry H Bur/0n by MAI/y Patented June 2, 1925.

UNITED "STATES PATENT OFFICE.-

PERRY n. BUR-TON, or FLORAL PARK, NEwYonK, Assrenon T0 WESTERN ELECTRIC COMPANY, mconronn'rnn, or NEW YORK, n. Y., A CORPORATION or NEW YORK.

IMPULSE-RECEIVING- CIRCUIT.

Application filed April 26, 1923. Serial No. 634,706.

change systems and more particularly to systems in which connections are effected by means of automatic switches.

In such systems the operation of the, auto-v matic switches takes place either directly or,

indirectly because of a number of interruptions of the line circuit brought about by the subscriber in adjusting his dial, or other impulse sending device. These interruptions of the circuit react upon some device in the circuit to bring about the movement of the switches. It is obvious that, if connections are to be accurately established this device must respond promptly to such inter-- ruptions and the switches or other mechanisms controlled thereby must completely performthe action thus initiated.

In general, therefore, it is the object of the present invention to provide means for making the response of automatic mechanism to dial pulses accurate to a very'high degree.

In accordance with this object, a particular feature of the invention relates to the provision of a novel electromagnetic device and circuits therefor bywhich the interruptions of the circuit by the dial cause promptin the drawing the invention illustrated applied to a receiving and recording mechanisin which receivesthe pulses transn'ntted from the subscribers dial and records them Only so much of on registering devices. the telephone system as is necessary for. an understanding of the invention itself has been shown. While the invention is particu larly well adapted for use in this'part of the telephone system, itis obvious that it may be equally well applied to other parts or to other systems.

Thedrawing illustrates a SLlbSCL'liKZL S telephone substationlOO provided with a dial 101. This substation is connected to the central oflice, where, in any well known manner, it may be extended through a line switch or line finder either to a trunk 102 and 103 leading to a selector switch or to an operators position. Inasmuch as the line extending means forms no essential part of this invention it has not been illustrated in the drawing. A part of the impulse receiving and recording mechanism is also shown together with a diagrammatic indication of a step-by-step switch 104: for selecting any one of a plurality of such mechanisms for use in connection with a given call.

The operation of the circuits is as fol lows:

Then the subscriber at substation 100 initiates a call, the removal of the receiver from the hook brings about the connection of theline to an idle trunk leading to a selector switch and the association of an impulse receiving and recording mechanism with the line. \Vhen such connections are completed the subscriber is notified by means of a tone that he is at liberty to operate his dial.

' On the completion of the connections above referred to, a circuit is established from grounded battery, winding of relay 105, conductor 106, brush 107, conductor 103, over the loop of calling'line 100, conductor 102, brush 108, conductor 109,- through the left-hand winding of coil 110 to ground. Relay 105 is energized in this circuit and at its outer front contact closes an obvious circuit forslow-to-release relay 111, which relay energizes. At the inner front contact of'relay 105, a circuit is closed from grounded battery, resistance 125, winding and armature and back contact of magnet 112 of register A, contact 113 and brush 114 of re'gister control switch RC, winding of slow--to'-release relay 115, conductor 116, left-hand low resistance winding of relay 117, left-hand low resistance winding of relay 118, normally made contact of relay 118, through the high resistance right-hand windingsof relays 118 and 117 in parallel, conductor 123, to ground. Relay 117 energizes but relay 118 cannot, due to the particular mechanical construction and relation of the armatures of relays 1,1 and ,105,

Ina-l Due to the inclusion in the above traced circuit of the high resistance windings of relays 117 and 118, neither relay 115 nor magnet 112 is energized. The arinatures of relays 11S and 105 are arranged to react upon one another in the following manner. To the armature 119 of relay 118 is pivoted a bar 120 provided with a shoulder 121 near its free end. The armature 122 of relay 105 has an opening near the end in which the end of bar 120 slides freely. lVith both relays deenergized and their arinatures retracted, the bar 120 rests in the opening in armature 122. When relay 105 is energized, its armature 122 rests against the shoulder 121. lVith current flowing through both relays, relay 118 is prevented from attracting its armature by the pressure of the armature 122 against the shoulder, since relay 105 is magnetically more powerful than relay 1'18. lVith current flowing through relay 118, if relay 105 deenergizes, relay 118 will attract its armature very quickly and the mechanical thrust of the shoulder 121. against armature 122 will insure the rapid and complete opening of the circuits closed by the armature of relay 105. It is therefore possible to greatly reduce the tension which would normally be applied to the retractable spring of armature 12-2 so that relay 105 is ablet-oattract its armature easily and quickly, while at the same time the prompt and complete retraction of its armature is assured. \Vith relay 11S energized and with the increased current flowing through the winding of said relay due to circuit changes introduced on its operation, relay 105 is unable to attract its armature 122 against the pressure exerted by shoulder 121.

Returning to the operation of the circuit, the energization of relays 117 and 111. closes a second ground. tovconductor 123 by way of the armature andLconta-ct of relay 11.1 and the armature and contact of relay 117. When new the subscriber operates his dial to interrupt the above circuit for relay 105, that relay deenergizcs and promptly opens the contacts controlled by its armature as outlined aboye. Due to the ground connected to conductor 123 by 'way of the armatures of relays 1117 and 111. relays 117 and 118 areheld energized. Relay 111, being slow to release, does not retract its armature during the interruptions introduced by dialing. its soon as the circuit through relay 105 is opened, relay 118 is enabled to attract its armature 119-; Armature 119 controls makebetore-lneak contacts so that a circuit from ground to conductor 123 through the low resistance left-hand windings of relays 117 and 118' in series to conductor 116,, relay .115 and magnet 112 is closed before the original circuit through the high resistance windings and; the low resistance windings is broken. T he" circuit of magnet 11.2 ma 7 nowbe traced from grounded battery, resistance 125, winding of magnet 112 and its armature and back contact, contact 113 and brush 114 of switch RC, winding of relay 115, conductor 110, left-hand low resistance winding of relay 117, left-hand low resistance winding and alternate contact of relay 11S, armature and front contact of relay 117, armature and front contact of relay 111, to ground. Current flowing in this circuit is suflicient to operate relay 115 and magnet 112. Magnet 112 attracts its armature opening its operating circuit. The opening of the circuit permits relays 118 and 117 to retract their armatures but does not persist for a su'liicient time to permit relay 115 to retract its armature. As soon as the operating circuit is opened, nnignet 112 releases and advances switch A one step. The retraction of the armature of relay 117 disconnects ground from conductor 1.23 and prevents the reenergization of relay 118 when magnet 112 again closes its back contact. Had the tin cuit for relay 105 closed before magnet 112 caused the advance of switch A the actuated condition of relay 118 would prevent relay 105 from closing its contacts thus insuring a complete step of the switch for each interruption of the circuit of relay 105. hen magnet 11.2 opens the circuit of relay 118 and that relay retracts its armature, relay 105 is free to close its contacts and the cycle of operation just outlined will be repeated for each opening of the line circuit by dial 101.

lVhen, at the close of the series of impulses corresponding to a digit, relay 105 remains operated for a longer period, the reduced current through relay 115 permits the release of that relay and the corresponding release of magnet 12 1, which advances switch HG to its next position thus transferring the pulse circuit from switch A to switch 11 to register the second set of pulses on such register.

Vhen the mechanism is no longer required, the trunk 102 to 103 is opened long enough to permit relay 111 to release. Relay 111 at its back contact closes a circuit which, in any well l-tnown manner, may effect the release of the control switchllc and the rcgisl'ers A and P).

hat is claimed is:

1.-The combination with a line o ta relay controllable over said line, contacts controlled by said relay, an auxiliary relay, means to energize said auxiliary relay while said first relay is operated, and means under the control of said auxiliary relay for assisting in the opening of said contacts on the release of said first relay.

2. A relay, a second relay, armatures for said relays, a mechanical connection for said relay arinatures, means to operate said first relay, and means to energize said second retil) lay while said first relay is operated to make said first relay quick to release due to said mechanical connection.

3. The combination with a line. of a relay controllable over said line, an electromechanism external to said relay effective at certain times to render said relay quick to release and effective at other times to prevent the operation of said relay.

4:. The combination with aline, means for tiansn'iitting impulses thereover, a step-bystep device controllable by said impulses, and a line relay to repeat impulses to said step-by-step device, of an electromechanism external to said line relay effective'at certain times to render said relay quick to release and efiiective at other times to preventthe operation of said line relay.

5. The combination with a line of .a relay controllable over said line, circuits closed on the operation of said relay, an auxiliary relay in one of said circuits, and a mechanical connection between the armatures of said relays controlled by said auxiliary relay to assist in the opening of said circuits upon the release of said first relay.

ti. The combination with a line of a relay controllable over said line, circuits closed bythe operation of said relay, an auxiliary relay in one of said circuits, means for preventing the operation of said auxiliary relay as long as said first relayis operated, means ettectiveupon the release of said first relay for permitting the operation of said auxiliary relay, the operatlon of said auxiliary relay being effective to assist in the opening of said circuits. I

7. The combination with a line of a relay controllable over said line, contacts closed by the operation of said relay, a second relay, means to complete circuits at one time to partially energize said second relay to assist in opening said contacts on the recase of the firstrelay, and other circuits completed at a different time to operate said second relay to prevent the operation of said first relay.

8. The combination with a line of a relay controllable over said line, circuits closed by said relay, an auxiliary relay having a low resistance and a high. resistance winding included in one of said circuits, a magnot included in .aid. circuit, the current flowing in said circuit being insuflicient to operate said magnet, means operated on the release oi? said first relay to include only the low resistance winding of said auxiliary relay in the circuit of said magnet whereby said magnet is operated, andineans to prevent the reoperation of said first relay until after the operation of said magnet.

9. The con'ibination with a line of a relay controllable over said line, a pair of auxiliary relays, each" having a high resistance and a low resistance winding, circuits closed by said first relay, one circuit including the high and low resistance windings of said pair of auxiliary relays and a magnet, another circuit including a slow relay which closes an alternative circuit to said auxiliary relays and magnet, the current flowing in either or both of said circuits, being insuflicient to operate said magnet, means for preventing the operation of one of said auxiliary relays as long as said first relay remains operated, means QiliQGlllVG upon the release of said relay for including only the low resistance windings oi the auxiliary relays in the circuit of said magnet, current flowing in this circuit being insufiicient to operate said magnet, and means for preventing the reoperation of said first relay until after the operation of said magnet.

10. The combination with a line of a relay controllableover said line, contacts controlled by the armature of said relay, a tie vice responsive to the opening of said contacts, means efiiective upon the release of saidrelay for insuring the opening of said contacts, and means for preventing the reoperation of said relay until said device has completed its operation.

11. The combination with a line of a relay controllable over said line, contacts controlled by the armature of said relay, a device responsive to the opening of said contacts, means effective upon the release of said relay for insuring the opening of said contacts, said means comprising an auxiliary relay, and means for preventing the reoperation of said first relay until said device has completed its operation.

12. The combination with a line, of a relay controllable over said line, contacts controlled by the armature of said relay, a device responsive to the opening of said contacts, means effective upon the release of said relay for insuring the opening of said contacts, said meanscomprising an auxiliary relay having an armature adapted to react upon the armature of said first relay, and means for preventing the reoperation. of said first relay until said device has completed its operation.

13. The combination with a line of a rc lay controllable over said line, cmitacts con trolled by the'ariuature oi" said relay, :1 device responsive to the opening of id con tacts, men-.ns etlective upon the release of said relay for insuring the opening 011" said contacts, said means comprising an. auxiliary relay having a jointed armature adapted to react upon the armature of said first relay, and means for preventing the reoperation of said first relay until said device has completed its operation.

14. The combination with a line of a re lay controllable over said line, contacts controlled by the a nature of said relay, a device responsive to the opening oi said con to means effective upon the release of said relay for insuring the opening of said contacts, said means comprising an auxiliary relay prmrided with a jointed armature having a shoulder adapted to engage the end of the armature of said first relay, and means {or preventing the reoperation of said first relay until said device has completed its operation.

1:). The combination with a line of a relay controllable over said line, contacts controlled by the arnnitur o "aid relay, a device responsive to the op: n51 of said contacts, means effective upon the release of said relay for insuring the opening of said contacts, said means comprising an auxiliary relay having a jointed armature, entering an opening in the armature of said first relay and provided with a shoulder to act upon said armature, and means for preventing the reoperation of said first relay until said device has completed its operation.

16. The combination with a circuit, and means for transmitting impulses thereover, of a relay responsive to said impulses, contacts controlled by the armature of said relay, a device responsive to the opening of said contacts, means eftective upon the release of said relay for insuring the opening of said contacts, said means comprising an auxiliary relay having a jointed arnniture entering an opening in the armature of said first relay and provided with a shoulder to act upon said armature, the pressure of said shoulder upon the armature T said l'irst relay preventing the closure of the contacts controlled thereby until said device has completed its operation.

17. The combination with a line of a relay controllable over said line, contacts controlled by the armature of said relay, :1 device responsive to the opening of said contacts, means effective upon the release of said relay t'or insuring the opening oi said contacts, said means eomprising an auxiliary relay having a jointed armature entering an opening in the armature of the first relay and provided with a shoulder to act upon said armature, the pressure oi. said shoulder upon the armature ol said first relay preventing the closure of the contacts controlled thereby until the circuit of said auxiliary relay is opened in response to the operation of said device.

In witness whereof, I hereunto subscribe my name this 19 day of April A. D., 1923.

PERRY H. BURTON. 

